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EP3775048B1 - Composition thermoplastique - Google Patents

Composition thermoplastique Download PDF

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Publication number
EP3775048B1
EP3775048B1 EP19714681.4A EP19714681A EP3775048B1 EP 3775048 B1 EP3775048 B1 EP 3775048B1 EP 19714681 A EP19714681 A EP 19714681A EP 3775048 B1 EP3775048 B1 EP 3775048B1
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Prior art keywords
thermoplastic
masterbatch
weight
silicone elastomer
composition
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German (de)
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EP3775048A1 (fr
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Sylvain Boucard
Yann GRADELET
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Multibase SA
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Multibase SA
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/56—Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/12—Polysiloxanes containing silicon bound to hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/04—Thermoplastic elastomer
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2310/00—Masterbatches

Definitions

  • thermoplastic silicone vulcanisates as masterbatch additives in thermoplastic compositions including thermoplastic elastomer compositions.
  • a process for making the masterbatch and thermoplastic composition is also described.
  • thermoplastic material is a plastic material that becomes pliable or moldable above a specific temperature and solidifies upon cooling. When reheated the thermoplastic material can be remoulded into a new shape.
  • thermoset material is a plastic that is irreversibly cured from a soft solid or viscous liquid prepolymer or resin and once cured/ hardened a thermoset material cannot be remoulded into a new shape upon reheating.
  • TPEs Thermoplastic elastomers
  • thermoplastic materials which possess both plastic and rubbery properties. Whilst TPEs have elastomeric mechanical properties, unlike conventional thermoset rubbers, they can be re-processed at elevated temperatures. This reprocess ability is a major advantage of TPEs over chemically crosslinked rubbers since it allows recycling of fabricated parts and results in a considerable reduction of scrap.
  • thermoplastic elastomers In general, two main types of thermoplastic elastomers are known, block copolymer TPEs and simple blend TPEs (physical blends).
  • Block copolymer TPEs contain
  • low glass transition temperature is understood to mean a glass transition temperature Tg below 15° C., preferably below 0° C., advantageously below -15° C., more advantageously below -30° C., possibly below -50° C.
  • the hard segments In block copolymer thermoplastic elastomers, the hard segments aggregate to form distinct micro phases and act as physical crosslinks for the soft phase, thereby imparting a rubbery character at room temperature. At elevated temperatures, the hard segments melt or soften and allow the copolymer to flow and to be processed.
  • the hard blocks are generally based on polyamides, polyurethanes, polyesters, polystyrene, polyolefin or a mixture of thereof.
  • the soft blocks are generally based on polyethers, polyester, polyolefin and copolymers or blends thereof.
  • TPEs referred to as simple blends or physical blends can be obtained by uniformly mixing an elastomeric component with a thermoplastic resin.
  • thermoplastic materials such as impact resistance.
  • HIPS high impact polystyrene
  • ABS acrylonitrile butadiene styrene
  • PVC polyvinylchloride
  • PP polypropylene
  • PA polyamides
  • NBR nitrile butadiene rubber
  • NR natural rubber
  • EVA ethylene vinyl acetate
  • MVS polymethacrylate butadiene styrene
  • olefinic elastomers such as polypropylene (PP) and/or polyethylene (PE) polymers and copolymers, and terpolymer of polyolefins, ethylene propylene diene monomer rubber (EPDM), styrene block polymer acrylic elastomers.
  • Siloxane masterbatches are masterbatches containing siloxanes (also referred to as silicones).
  • a masterbatch is typically a solid additive for plastic or other polymer which is used to impart desired properties to this plastic or other polymer.
  • a masterbatch is typically a concentrated mixture of additives encapsulated into a carrier resin during a process involving heat, which is then cooled and cut into granular shape. This imparts desired properties to a polymer.
  • Masterbatches are typically in solid form at ambient temperature, usually in a pelletized form.
  • Siloxane masterbatches are typically pelletized micro-dispersions of siloxane polymers, in various different plastic carrier resins at loadings of up to 50%. Siloxane Masterbatches are produced in solid form for ease of use.
  • siloxane polymers typically gums with a viscosity > 1 million mm 2 ⁇ s -1 (cSt), typically >15 million mm 2 ⁇ s -1 (cSt)) dispersed with for example an average particle size of 5 ⁇ m in various thermoplastics.
  • a siloxane is a compound which contains at least one Si-O-Si link.
  • a polymer is a compound containing repeating units.
  • a plastic or organic thermoplastic material or thermoplastic organic polymer is a polymer based on C-C links and having thermoplastic properties.
  • a siloxane polymer also called polysiloxane or silicone is a polymer containing repeating Si-O-Si units.
  • An organopolysiloxane compound is a polysiloxane bearing substituents which constituents contain organic moieties.
  • the addition level is limited to a maximum of up to about 5% by weight of silicone in the composition. Above this level, coalescence of the silicone domain is observed leading to a progressive and continuous loss in mechanical performance of the final blend comparatively to the initial. This noticeably results in an impact resistance loss, decrease of tensile strain and stress at break.
  • the viscosity values of high viscosity diorganopolysiloxane polymers e.g. ⁇ 1000000 mm 2 ⁇ s -1 (cSt)
  • cSt ⁇ 1000000 mm 2 ⁇ s -1
  • the siloxane may be a silicone gum which is a polymer of high molecular weight with a very high viscosity.
  • a gum will typically have a viscosity of at least 2000 000 mm 2 ⁇ s -1 (cSt) at 25°C but generally has a significantly greater viscosity.
  • cSt mm 2 ⁇ s -1
  • gums are often characterised by their Williams plasticity value in accordance with ASTM D-926-08 given the viscosity becomes very difficult to measure.
  • TPV thermoplastic vulcanizate
  • TPVs generally exhibit improved oil and solvent resistance as well as reduced compression set relative to the simple blends.
  • a TPV is formed by a process known as dynamic vulcanization, wherein the components required to make the elastomer (e.g. polymer, cross-linker and catalyst) and the thermoplastic matrix are mixed together and the elastomer is simultaneously cured to create a "co-continuous blend" of thermoplastic matrix and elastomer.
  • thermoplastic silicone elastomers and a method for preparing said thermoplastic elastomers.
  • TPVs are known in the art, including some wherein the crosslinked elastomeric component can be a silicone polymer cured with the aid of a crosslinking agent and/or catalyst during the mixing process while the thermoplastic component is an organic, non-silicone polymer such TPVs are sometimes referred to as thermoplastic silicone vulcanizates or TPSiVs subsequent to their manufacture, TPVs e.g. TPSiVs may be processed by conventional techniques, such as extrusion, vacuum forming, injection moulding, blow moulding, 3D printing or compression moulding, to fabricate plastic parts.
  • thermoplastic composition comprising a blend of
  • thermoplastic composition by making a masterbatch as hereinbefore described and blending the resulting masterbatch with one or more thermoplastic organic materials (A) in an amount such that the thermoplastic composition a total of from 0.2 to 25% by weight of cross-linked silicone elastomer based on the weight of (A) + (B).
  • the thermoplastic composition may be a thermoplastic elastomer composition.
  • Benefits of present invention include the ability to make a concentrate containing from 20 to 60% (by weight) of silicone elastomer, such concentrate being then able to be dispersed in a thermoplastic to have in the final material from 0.5 to 25% of Si Phase, the addition of this concentrate in the defined range leading to the adjustment of final product performance to the desired Impact, flexibility and surface performance.
  • thermoplastic silicone vulcanisates as masterbatch additives were surprisingly found to, for example, increase impact resistance, decrease mechanical modulus and increase surface properties when compared with non-modified thermoplastic compositions.
  • silanes and siloxanes are compounds containing silicon.
  • a polysiloxane comprises terminal groups and pendant groups.
  • a terminal group is a chemical group located on a Si atom which is at an end of the polymer chain.
  • a pendant group is a group located on a Si atom which Si atom is not at the end of the polymeric chain.
  • an organopolysiloxane contains a mixture of the following structures:
  • a cross linking reaction is a reaction where two or more molecules, at least one of them being a polymer, are joined together to harden or cure the polymer.
  • a cross linker is a compound able to produce a crosslinking reaction of a polymer.
  • the one or more thermoplastic organic materials (B1) may be selected from polycarbonates (PC); blends of polycarbonates with other polymers as exemplified by polycarbonate-acrylonitrile-butadiene-styrene (PC/ABS) blends and polycarbonate-polybutylene terephthalate (PC/PBT) blends; polyamides exemplified by Nylons such as polycaprolactam (Nylon-6), polylauryllactam (Nylon-12), polyhexamethyleneadipamide (Nylon-6,6), and polyhexamethylenedodecanamide (Nylon-6,12), poly(hexamethylene sebacamide (Nylon 6,10), and blends of Nylons with other polymers; polyesters exemplified by polybutylene terephthalate (PBT), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN);, , polyphenylene ether (PPE) and polyphenyleneoxide (PPO), and blends of
  • Component (B1) is present in an amount of from 40 to 80% by weight of the total weight of component B; alternatively, component (B1) is present in an amount of from 45 to 70% by weight of the total weight of component B.
  • Silicone elastomer (B2) may be prepared by curing one of the following compositions: (B2a1) A diorganopolysiloxane having an average of at least two alkenyl groups per molecule and either
  • Silicone elastomer (B2) may be prepared by curing a composition comprising
  • the silicone elastomer present in the masterbatch is present in an amount of from 20 to 60% by weight of the total weight of component (B); alternatively the silicone elastomer present in the masterbatch is present in an amount of from 30 to 55% by weight of the total weight of component (B);
  • alkyl groups having 1 to 20 carbon atoms such as methyl, ethyl, propyl, butyl, pentyl and hexyl
  • cycloalkyl groups such as cyclohexyl and cycloheptyl
  • alkenyl groups having 2 to 20 carbon atoms such as vinyl, allyl and hexenyl
  • aryl groups having 6 to 12 carbon atoms such as phenyl, tolyl and xylyl
  • halogenated alkyl groups having 1 to 20 carbon atoms such as 3,3,3-trifluoropropyl and chloromethyl.
  • Methyl preferably makes up at least 85, more preferably at least 90, mole percent of the silicon-bonded organic groups in component (B2a1).
  • Examples may include an ⁇ , ⁇ -vinyldimethylsiloxy polydimethylsiloxane, an ⁇ , ⁇ -vinyldimethylsiloxy copolymer of methylvinylsiloxane and dimethylsiloxane units, and/or an ⁇ , ⁇ -trimethylsiloxy copolymer of methylvinylsiloxane and dimethylsiloxane units.
  • the diorganopolysiloxane polymer (B2a1) has a viscosity of at least 1000000 mm 2 ⁇ s -1 (cSt) at 25°C measured may be measured by using an AR 2000 Rheometer from TA Instruments of New Castle, DE, USA or a suitable Brookfield viscometer with the most appropriate spindle for the viscosity being measured.
  • the diorganopolysiloxane polymer (B2a1) can if desired be a gum characterized by a Williams plasticity value of at least 100mm/100 as measured by ASTM D-926-08 using a Williams Parallel plate plastimeter given the viscosity values are so high they become very difficult to determine with accuracy.
  • the diorganopolysiloxane polymer (B2a1) can if desired be modified with a small amount of an unreactive silicone such as a trimethylsilyl-terminated polydimethylsiloxane.
  • the diorganopolysiloxane polymer (B2a1) is a gum.
  • the alkenyl groups of the diorganopolysiloxane (B2a1) can be exemplified by vinyl, hexenyl, allyl, butenyl, pentenyl, and heptenyl groups.
  • Silicon-bonded organic groups in diorganopolysiloxane polymer (B2a1) other than alkenyl groups may be exemplified by methyl, ethyl, propyl, butyl, pentyl, hexyl, or similar alkyl groups; or phenyl, tolyl, xylyl, or similar aryl groups.
  • Organopolysiloxane having at least two Si-bonded hydrogen atoms, alternatively at least three Si-bonded hydrogen atoms per molecule (B2a2)
  • the silicon-bonded organic groups of component (B2a2) are independently selected from any of the hydrocarbon or halogenated hydrocarbon groups described above in connection with diorganopolysiloxane (B2a1 and B2b1), including preferred embodiments thereof.
  • R4 can for example be a lower alkyl group having 1 to 3 carbon atoms, such as a methyl group.
  • the Organopolysiloxane having at least two Si-bonded hydrogen atoms, alternatively at least three Si-bonded hydrogen atoms per molecule (B2a2) can for example have a viscosity of from 0.5 to 1000 mm 2 ⁇ s -1 (cSt) at 25°C, alternatively 2 to 100 mm 2 ⁇ s -1 (cSt) or 5 to 60 mm 2 ⁇ s -1 (cSt) at 25°C.
  • the average degree of polymerisation of (B2a2) can for example be in the range 30 to 400 siloxane units per molecule.
  • Component (B2a2) may be exemplified by the following siloxanes typically having a viscosity of from 0.5 to 1000 mm 2 ⁇ s -1 (cSt) at 25°C low molecular siloxanes, such as PhSi(OSiMe 2 H) 3 ; trimethylsiloxy-end blocked methylhydridopolysiloxanes; trimethylsiloxy-end blocked dimethylsiloxane-methylhydridosiloxane copolymers; dimethylhydridosiloxy-endblocked dimethylpolysiloxanes; dimethylhydrogensiloxy-end blocked methylhydrogenpolysiloxanes; dimethylhydridosiloxy-endblocked dimethylsiloxane-methylhydridosiloxane copolymers; cyclic methylhydrogenpolysiloxanes; cyclic dimethylsiloxane-methylhydridosiloxane copolymers; tetrakis(dimethylhydrogensiloxy)s
  • the molar ratio of Si-H groups in (B2a2)_to aliphatically unsaturated groups in the diorganopolysiloxane polymer (B2a1) is preferably at least 1:1 and can be up to 8:1 or 10:1.
  • the molar ratio of Si-H groups to aliphatically unsaturated groups is in the range from 1.5:1 to 5:1.
  • (B2a2) is used at a level such that the molar ratio of Si-H therein to Si-OH in component (B2b1) is about 0.5 to 10, preferably 1 to 5 and most preferably about 1.5.
  • Catalysts based on other platinum group metals can be exemplified by rhodium, ruthenium, iridium, or palladium compounds.
  • these catalysts can be represented by the following formulas: RhCl(PPh 3 ) 3 , RhCl(CO)(PPh 3 ) 2 , Ru 3 (CO) 12 , IrCl(CO)(PPh 3 ) 2 , and Pd(PPh 3 ) 4 (where Ph stands for a phenyl group).
  • the catalyst (B2a3) is preferably used in an amount of 0.5 to 100 parts per million by weight platinum group metal based on the polyorganosiloxane composition (B), more preferably 1 to 50 parts per million.
  • the hydrosilylation catalyst (B2a3) catalyses the reaction of the alkenyl groups of diorganopolysiloxane polymer (B2a1) with the Si-H groups of (B2a2).
  • an inhibitor may be included in the composition to retard the cure process.
  • inhibitor it is meant herein a material that retards curing of Components (B2a1) when incorporated therein in small amounts, such as less than 10 percent by weight of the silicone composition of (B2a1) without preventing the overall curing of the mixture.
  • Inhibitors of platinum group based catalysts (B2a5), especially platinum based catalysts (B2a5) are well known. They include hydrazines, triazoles, phosphines, mercaptans, organic nitrogen compounds, acetylenic alcohols, silylated acetylenic alcohols, maleates, fumarates, ethylenically or aromatically unsaturated amides, ethylenically unsaturated isocyanates, olefinic siloxanes, unsaturated hydrocarbon monoesters and diesters, conjugated ene-ynes, hydroperoxides, nitriles, and diaziridines.
  • the inhibitors (B2a5) used herein, when present, may be selected from the group consisting of acetylenic alcohols and their derivatives, containing at least one unsaturated bond.
  • acetylenic alcohols and their derivatives include 1-ethynyl-1-cyclohexanol (ETCH), 2-methyl-3-butyn-2-ol, 3-butyn-1-ol, 3-butyn-2-ol, propargylalcohol, 2-phenyl-2-propyn-1-ol, 3,5-dimethyl-1-hexyn-3-ol, 1-ethynylcyclopentanol, 1-phenyl-2-propynol, 3-methyl-1-penten-4-yn-3-ol, and mixtures thereof.
  • ECH 1-ethynyl-1-cyclohexanol
  • 2-methyl-3-butyn-2-ol 3-butyn-1-ol
  • 3-butyn-2-ol propargylalcohol
  • the inhibitor (B2a5) is selected from the group consisting of 1- ethynyl-1-cyclohexanol, 2-methyl-3-butyn-2-ol, 3-butyn-1-ol, 3-butyn-2-ol, propargylalcohol, 2-phenyl-2-propyn-1-ol, 3,5-dimethyl-1-hexyn-3-ol, 1-ethynylcyclopentanol, 1-phenyl-2-propynol, and mixtures thereof.
  • the inhibitor (B2a5) may typically be a acetylenic alcohols where the at least one unsaturated bond (alkenyl group) is in a terminal position, and further, a methyl or phenyl group may be at the alpha position.
  • the inhibitor may be selected from the group consisting of 1-ethynyl-1-cyclohexanol, 2-methyl-3-butyn-2-ol, 3-butyn-1-ol, 3-butyn-2-ol, propargylalcohol, 2-phenyl-2-propyn-1-ol, 1-phenyl-2-propynol, and mixtures thereof.
  • the inhibitor (B2a5) may be added in the range of from 0 to 10% by weight of component (B), alternatively 0.05 to 5% by weight of component (B2) But is generally used in an amount sufficient to retard cure of diorganopolysiloxane gum (B2a1) which may be optimized for a given system by those skilled in the art using routine experimentation.
  • Radical initiator (B2a4) is a compound which decomposes at elevated temperature to form radical species.
  • the latter promotes the crosslinking reaction between the alkenyl groups of diorganopolysiloxane gum (B2a1) during the dynamic vulcanization step of the instant method.
  • This component may be illustrated by known azo compounds, carbon compounds and organic peroxy compounds, such as hydroperoxides, diacyl peroxides, ketone peroxides, peroxyesters, dialkyl peroxides, diaryl peroxides, aryl-alkyl peroxides, peroxydicarbonates, peroxyketals, peroxy acids, acyl alkylsulfonyl peroxides and alkyl monoperoxydicarbonates.
  • radical initiators include 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile), dibenzoyl peroxide, tert-amyl peroxyacetate, 1,4-di(2-tert-butylperoxyisopropyl)benzene, tert-butyl cumyl peroxide, 2,4,4-trimethylpentyl-2 hydroperoxide, diisopropylbenzene monohydroperoxide, cumyl hydroperoxide, tert-butyl hydroperoxide, tert-amyl hydroperoxide, 1,1-di(tert-butylperoxy)cyclohexane, tert-butylperoxy isopropyl carbonate, tert-amyl peroxybenzoate, dicumyl peroxide, 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane bis(1-
  • Diorganopolysiloxane (B2b1) is a fluid or gum terminated with silanol (i.e., --Si-OH) groups having a viscosity of at least 100 000 mm 2 ⁇ s -1 (cSt) at 25° C, alternatively at least 1000000 mm 2 ⁇ s -1 (cSt) at 25°C.
  • the silicon-bonded organic groups of component (B2b1) are independently selected from hydrocarbon or halogenated hydrocarbon groups as defined for B2a1) above. Again, methyl preferably makes up at least 85, more preferably at least 90, mole percent of the silicon-bonded organic groups in component (B2b 1).
  • polydiorganosiloxane (B2b 1) can be a homopolymer, a copolymer or a terpolymer containing such organic groups.
  • examples include fluids or gums comprising dimethylsiloxy units, dimethylsiloxy units and phenylmethylsiloxy units; dimethylsiloxy units and diphenylsiloxy units; and dimethylsiloxy units, diphenylsiloxy units and phenylmethylsiloxy units, among others.
  • the molecular structure is also not critical and is exemplified by straight-chain and partially branched straight-chain, linear structures being preferred.
  • organopolysiloxane (B2b 1) include: dimethylhydroxysiloxy - end-blocked dimethylsiloxane homopolymers; dimethylhydroxysiloxy end-blocked methylphenylsiloxane-dimethylsiloxane copolymers; and dimethylhydroxysiloxy-endblocked methylphenylpolysiloxanes.
  • Preferred systems for low temperature applications include silanol-functional methylphenylsiloxane-dimethylsiloxane copolymers and diphenylsiloxane-dimethylsiloxane copolymers, particularly wherein the molar content of the dimethylsiloxane units is about 93%.
  • Component (B2b 1) may also consist of combinations of two or more organopolysiloxane fluids or gums. Most preferably, component (B2b 1) is a polydimethylsiloxane homopolymer which is terminated with a silanol group at each end of the molecule.
  • the molecular weight of the diorganopolysiloxane (B2b 1) is sufficient to impart a Williams plasticity number of at least about 30 as determined by ASTM D-926-08, typically at least 100/100mm.
  • the Williams plasticity number is defined as the thickness in millimeters ⁇ 100 of a cylindrical test specimen 2 cm 3 in volume and approximately 10 mm in height after the specimen has been subjected to a compressive load of 49 Newtons for three minutes at 25° C.
  • the plasticity number should be about 100 to 200, most preferably about 120 to 185. We have found that such gums can readily be dispersed in the one or more thermoplastic organic materials (B 1) without the need for filler (B2c).
  • fluid diorganopolysiloxanes having a viscosity of about 100 000 to 1000 000 mm 2 ⁇ s -1 (cSt) at 25° C. often cannot be readily dispersed in the one or more thermoplastic organic materials (B1).
  • the fluid must be mixed with up to about 300 parts by weight of filler (B2c), for each 100 parts by weight of (B2b1) in order to facilitate dispersion.
  • the fluid and filler are mixed before adding this combination to the one or more thermoplastic organic materials (B1), but these can be added separately.
  • the condensation catalyst (B2b3) of the present invention is any compound which will promote the condensation reaction between the Si-OH groups of diorganopolysiloxane (B2b1) and the Si-H groups of the Organopolysiloxane having at least two Si-bonded hydrogen atoms, alternatively at least three Si-bonded hydrogen atoms per molecule (B2a2) so as to cure the former by the formation of --Si--O--Si-- bonds.
  • catalyst (B2b3) cannot be a platinum compound or complex since the use of such a condensation catalyst often results in poor processing as well as poor physical properties of the resulting TPSiV.
  • the condensation catalyst (B2b3) is present in an amount sufficient to cure diorganopolysiloxane (B2b1) and the Organopolysiloxane having at least two Si-bonded hydrogen atoms, alternatively at least three Si-bonded hydrogen atoms per molecule (B2a2) (B2a2) as defined above.
  • Suitable catalysts include metal carboxylates, such as dibutyltin diacetate, dibutyltin dilaurate, tin tripropyl acetate, stannous octoate, stannous oxalate, stannous naphthanate; amines, such as triethyl amine, ethylenetriamine; and quaternary ammonium compounds, such as benzyltrimethylammoniumhydroxide, beta-hydroxyethylltrimethylammonium-2-ethylhexoate and beta-hydroxyethylbenzyltrimethyldimethylammoniumbutoxide (see, e.g., US3,024,210 ).
  • metal carboxylates such as dibutyltin diacetate, dibutyltin dilaurate, tin tripropyl acetate, stannous octoate, stannous oxalate, stannous naphthanate
  • amines such as triethy
  • the silica can for example be treated with an alkoxysilane, for example a silane comprising at least one Si-bonded alkoxy group and at least one Si-bonded alkenyl group or at least one Si-bonded hydrogen atom.
  • the alkoxysilane can be a monoalkoxysilane, a dialkoxysilane or a trialkoxysilane containing at least one aliphatically unsaturated hydrocarbon group such as a vinylalkoxysilane, for example vinyltrimethoxysilane, vinyltriethoxysilane or vinymethyldimethoxysilane.
  • the Si-bonded alkoxy groups are readily hydrolysable to silanol groups which bond to the silica surface.
  • the silica can alternatively be treated with a polysiloxane, for example an oligomeric organopolysiloxane, containing Si-bonded alkenyl groups and silanol end groups.
  • a polysiloxane for example an oligomeric organopolysiloxane, containing Si-bonded alkenyl groups and silanol end groups.
  • thermoplastic organic materials (B 1) may be a mixture of more than one of the thermoplastic resins described above.
  • Component (A)) may be a mixture of more than one of the thermoplastic materials described above.
  • Component (A) and component (B 1) may be the same or different.
  • Mineral oils are generally petroleum distillates in the C 15 to C 40 range, for example white oil, liquid paraffin or a naphthenic oil. If used, the mineral oil can for example be premixed with the thermoplastic organic polymer (A). The mineral oil can for example be present in an amount of from 0.5 to 20% by weight based on the thermoplastic organic polymer (A).
  • Plasticizers can be present in combination with or alternatively to mineral oils. Examples of suitable plasticisers include phosphate ester plasticisers such as triaryl phosphate isopropylated, resorcinal bis-(diphenyl phosphate) or phosphate ester sold by Great Lakes Chemical Corporation under the trade mark Reofos ® RDP. Such plasticizers can for example be used in a range from 0.5 up to 15% by weight of the composition.
  • thermoplastic elastomer composition of this invention can be applied on textile creating a laminate forming a synthetic leather product.
  • Co-extrusion or post processing with a compatible material, thermoplastic, synthetic woven or non-woven textile can be achieved to form a complex laminate.
  • Co-extrusion or post processing with a non compatible material thermoplastic, synthetic or natural woven or non-woven textile, to form a complex laminate can be achieved using adequate primer or interfacial material.
  • thermoplastic olefinic material MULTIFLEX ® TPO 7003 SW BLK was utilised as the reference material. Samples were prepared by mixing the desired quantity of siloxane masterbatch additive pellets dry blended into MULTIFLEX ® TPO 7003 SW BLK pellets in order to reach respectively 0wt% (Control), 2wt%, 5wt%, 10wt% and 20wt% of the various siloxane masterbatch additives considered. The resulting mixture was then prepared as a thermoplastic material by injection moulding.
  • Carrier 100% by weight of polyethylene carrier used to make the following masterbatches.
  • Masterbatch 2 A masterbatch comprising 50% by weight of a siloxane base comprising dimethylvinyl terminated polydimethylsiloxane gum having a plasticity of about 150mm/100, a hydrophobically treated precipitated silica and 50% by weight of polyethylene carrier and an alkoxy silicone polymer : prepared with a 25mm (L/D: 48) COPERION-ZSK twin screw extruder. In the Examples below 0.1% by weight of a Phenolic rad. Scavenger was also used in the composition of Masterbatch 2.)
  • Masterbatch 3 A 'TPSiV' Masterbatch made from the siloxane base of Masterbatch 2 in combination with a cure package comprising a methylhydrogen siloxane crosslinker (Dp: 56.6; D': 38.5) in an adjusted quantity corresponding to a hydrogen siloxane group over Vinyl siloxane group ratio of 6.0 : 1 and 2- a platinum IV catalyst at a 150 ppm concentration compared to Vinyl siloxane group concentration; the masterbatch 2: prepared with a 25mm (L/D: 48) COPERION-ZSK twin screw extruder - pilot equipment.
  • Dp methylhydrogen siloxane crosslinker

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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  • Compositions Of Macromolecular Compounds (AREA)
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Claims (10)

  1. Composition thermoplastique comprenant un mélange de :
    (A) un ou plusieurs matériaux organiques thermoplastiques, avec
    (B) une composition de mélange-maître thermoplastique comprenant
    (B1) un ou plusieurs matériaux organiques thermoplastiques,
    (B2) un élastomère de silicone ; et facultativement
    (B3) un polymère d'organopolysiloxane non durci,
    dans lequel mélange-maître (B) est contenu de 20 % à 60 % en poids d'élastomère de silicone réticulé sur la base du poids de (B1) + (B2) + (B3), et
    dans laquelle composition thermoplastique se trouve un total de 0,2 à 25 % en poids d'élastomère de silicone réticulé sur la base du poids de (A) + (B).
  2. Composition thermoplastique selon la revendication 1, dans laquelle l'élastomère de silicone (B2) est préparé par vulcanisation dynamique de :
    diorganopolysiloxane (B2a1) ayant une moyenne d'au moins deux groupes alcényle par molécule et soit
    (i) un organopolysiloxane ayant au moins deux atomes d'hydrogène liés à du Si, alternativement au moins trois atomes d'hydrogène liés à du Si par molécule (B2a2) et un catalyseur d'hydrosilylation (B2a3) et facultativement un inhibiteur de catalyseur (B2a5) ; soit
    (ii) un initiateur de radicaux (B2a4) ; ou
    un diorganopolysiloxane terminé par un groupe silanol (B2b1),
    un organopolysiloxane ayant au moins deux atomes d'hydrogène liés à du Si, alternativement au moins trois atomes d'hydrogène liés à du Si par molécule (B2a2) et
    un catalyseur de condensation (B2b3).
  3. Composition thermoplastique selon la revendication 1, dans laquelle le diorganopolysiloxane (B2a1) ou le diorganopolysiloxane (B2b1) est une gomme ayant une valeur de plasticité de Williams d'au moins 100 mm/100 telle que mesurée selon la norme ASTM D-926-08.
  4. Composition thermoplastique selon l'une quelconque des revendications précédentes, dans laquelle le un ou plusieurs matériaux organiques thermoplastiques (B1) sont sélectionnés parmi les polycarbonates ; les mélanges de polycarbonates avec d'autres polymères ; les polyamides et les mélanges de polyamides avec d'autres polymères ; les polyesters ; le poly(éther de phénylène) (PPE) et le poly(oxyde de phénylène) (PPO), et les mélanges de PPE ou de PPO avec des agents styréniques ; du poly(sulfure de phénylène) (PPS), de la polyéther sulfone (PES), des polyaramides, des polyimides, des résines contenant un groupe phényle ayant une structure de tige rigide, des matériaux styréniques ; des polyacrylates, SAN ; des polycétones, du poly(méthacrylate de méthyle) (PMMA), des polyoléfines ; des copolymères et des mélanges de polyoléfines ; des uréthanes thermoplastiques, des élastomères polyoléfiniques thermoplastiques, des vulcanisats thermoplastiques ; un copolymère de styrène éthylène butylène styrène (SEBS), des produits d'origine naturelle étant des substances cellulosiques, de la rayonne, ou du poly(acide lactique) et des mélanges de ceux-ci.
  5. Composition thermoplastique selon la revendication 1, dans laquelle un ou plusieurs matériaux organiques thermoplastiques (A) sont sélectionnés parmi les polycarbonates ; les mélanges de polycarbonates avec d'autres polymères ; les polyamides et les mélanges de polyamides avec d'autres polymères ; les polyesters ; le poly(éther de phénylène) (PPE) et le poly(oxyde de phénylène) (PPO), et les mélanges de PPE ou de PPO avec des agents styréniques ; du poly(sulfure de phénylène) (PPS), de la polyéther sulfone (PES), des polyaramides, des polyimides, des résines contenant un groupe phényle ayant une structure de tige rigide, des matériaux styréniques ; des polyacrylates, SAN ; des polycétones, du poly(méthacrylate de méthyle) (PMMA), des polyoléfines ; des copolymères et des mélanges de polyoléfines ; des uréthanes thermoplastiques, des élastomères polyoléfiniques thermoplastiques, des vulcanisats thermoplastiques ; un copolymère de styrène éthylène butylène styrène (SEBS), des produits d'origine naturelle étant des substances cellulosiques, de la rayonne, ou du poly(acide lactique) et des mélanges de ceux-ci.
  6. Procédé de fabrication de la composition thermoplastique selon l'une quelconque des revendications 1 à 3, dans lequel le mélange-maître (B) est fabriqué par :
    (i) mélange des composants utilisés pour produire un élastomère de silicone (B2) avec un ou plusieurs matériaux organiques thermoplastiques (B1),
    (ii) vulcanisation dynamique de la composition de silicone pour former un élastomère de silicone (B2), et
    (iii) introduction (B3), durant l'étape (ii) ou après l'étape (iii) ;
    dans lequel mélange-maître (B) est contenu un total de 20 % à 60 % en poids des composants (B2) + (B3) sur la base du poids de (B1) + (B2) + (B3), et
    mélange du mélange-maître résultant avec un ou plusieurs matériaux organiques thermoplastiques (A) en une quantité telle que la composition thermoplastique contient un total de 0,2 à 25 % en poids d'élastomère de silicone réticulé sur la base du poids de (A) + (B).
  7. Procédé de fabrication d'une composition thermoplastique selon l'une quelconque des revendications 1 à 4 par :
    (i) chauffage et passage du composant (B1) avec un ou plusieurs matériaux organiques thermoplastiques à travers une extrudeuse et introduction des composants utilisés pour produire un élastomère de silicone (B2) dans le composant (B1) individuellement ou collectivement
    (ii) mélange et vulcanisation dynamique des composants utilisés pour produire l'élastomère de silicone (B2) pour former l'élastomère de silicone (B2), et
    (iii) introduction de (B3), lorsque présent, durant l'étape (i) ou après l'étape (ii) ;
    dans lequel mélange-maître (B) est contenu de 20 % à 60 % en poids d'élastomère de silicone réticulé sur la base du poids de (B1) + (B2) + (B3), et
    mélange du mélange-maître résultant avec un ou plusieurs matériaux organiques thermoplastiques (A) en une quantité de sorte que la composition thermoplastique contient un total de 0,2 à 25 % en poids d'élastomère de silicone réticulé sur la base du poids de (A) + (B).
  8. Article portable tel qu'un bracelet ou un tampon de support pour lunettes de soleil, lunettes de lecture ou dispositifs électroniques portables, dans lequel l'article portable comprend la composition thermoplastique selon l'une quelconque des revendications 1 à 5.
  9. Utilisation d'une composition thermoplastique selon l'une quelconque des revendications 1 à 5, pour former un article portable destiné à se trouver en contact avec la peau du porteur lorsqu'il se trouve en cours d'utilisation.
  10. Utilisation d'une composition thermoplastique selon l'une quelconque des revendications 1 à 5, dans ou pour une partie ou un composant d'applications d'équipements de sport, d'article chaussant, d'automobiles, d'appareils électroménagers, d'appareils électroniques, d'appareils électroniques portables, d'applications électriques, de communication, et médicales.
EP19714681.4A 2018-04-05 2019-04-05 Composition thermoplastique Active EP3775048B1 (fr)

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CN115477848B (zh) * 2021-11-30 2024-06-04 上海涵点新材料有限公司 一种低voc、不迁移的耐刮擦剂及其应用
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CN118374144B (zh) * 2024-06-21 2024-10-29 江苏弘盛新材料股份有限公司 一种大飞机轮胎用聚酰胺材料的制备方法

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JP7498116B2 (ja) 2024-06-11
CN112074571A (zh) 2020-12-11
WO2019193192A1 (fr) 2019-10-10
EP3775048A1 (fr) 2021-02-17
KR102842291B1 (ko) 2025-08-06
KR20200140850A (ko) 2020-12-16
US20210024750A1 (en) 2021-01-28

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